#1C4B00

CSS

:root {
  --woodland-grass: #1c4b00;
  --woodland-grass-rgb: 28 75 0;
  --woodland-grass-oklch: oklch(0.365 0.112 137.5);
}

.element {
  color: var(--woodland-grass);
  background-color: hsl(98 100% 15%);
  border-color: oklch(0.365 0.112 137.5);
}

Tailwind CSS v4

@theme {
  --color-woodland-grass: #1c4b00;
  --color-woodland-grass-50: #e5fedf;
  --color-woodland-grass-100: #d5f2ce;
  --color-woodland-grass-200: #bce1b3;
  --color-woodland-grass-300: #9ac68f;
  --color-woodland-grass-400: #7eae6c;
  --color-woodland-grass-500: #60974a;
  --color-woodland-grass-600: #528040;
  --color-woodland-grass-700: #416633;
  --color-woodland-grass-800: #304b22;
  --color-woodland-grass-900: #213416;
  --color-woodland-grass-950: #101f08;
}

SCSS

$woodland-grass: #1c4b00;
$woodland-grass-rgb: 28, 75, 0;
$woodland-grass-light: mix(#fff, $woodland-grass, 20%);
$woodland-grass-dark: mix(#000, $woodland-grass, 20%);

.element {
  color: $woodland-grass;
  box-shadow: 0 0 0 2px rgba($woodland-grass, 0.35);
}